Ask two different builders for the "size" of a 2 BHK and you can end up with two very different numbers for what is practically the same flat. That's because Indian real estate brochures use three distinct measurements, and knowing which one you're looking at changes how you should read the price.
Carpet Area
This is the actual usable floor space inside your four walls — literally the area you could cover with a carpet. It excludes the thickness of internal walls, balconies, and shared spaces. Since RERA came into force, carpet area is the figure builders are legally required to disclose, because it's the only one that tells you what you're actually getting to live in.
Built-Up Area
Built-up area adds the thickness of your own walls and any balcony or utility area to the carpet area. It's usually 10–15% larger than the carpet area. A flat with 800 sq. ft. carpet area might show up as roughly 900–920 sq. ft. built-up.
Super Built-Up Area
This is the number you'll most often see quoted in marketing material, and it's also the biggest. Super built-up area takes the built-up area and adds a proportional share of common areas — the lobby, staircases, lift shafts, and clubhouse. Depending on the project, this "loading" can add another 20–35% on top of built-up area.
Why This Matters When You Compare Price
If one project quotes ₹8,000 per sq. ft. on super built-up area and another quotes ₹9,500 per sq. ft. on carpet area, the second one could actually be cheaper once you convert both to the same basis. Always ask for the carpet area and the loading percentage before comparing two properties on price — comparing raw per-square-foot rates across different area definitions is one of the most common mistakes first-time buyers make.
A Quick Way to Sanity-Check Any Listing
Ask the seller or agent for all three numbers, not just one. A reasonable loading factor between carpet area and super built-up area is typically 25–30% for a mid-rise apartment with standard amenities; anything significantly higher is worth questioning, especially in a project with a large clubhouse or extensive common areas that you're effectively paying for but can't fully use privately.
